Dielectric breakdown of BaO–B2O3–ZnO–[(BaZr0.2Ti0.80)O3]0.85 [(Ba0.70Ca0.30)TiO3]0.15 glass-ceramic composites

We have successfully synthesized and characterized the alkali-free glass 0.3 BaO + 0.6B2O3 + 0.1ZnO (BBZ) and electro ceramics [(BaZr0.2Ti0.80)O3]0.85–[(Ba0.70Ca0.30)TiO3]0.15 (BZT–BCT) composite for high energy density storage capacitor applications. First single phase BZT–BCT ceramic powders were prepared by conventional solid state reaction technique. X-ray diffraction studies of the sintered pellets revealed the pure perovskite phase with tetragonal to pseudocubic (rhombohedral phase). Raman spectroscopy results also confirmed the perovskite phase with tetragonal structure. These powders were mixed with 10–50 weight percentage of glass powder and were ground using low energy ball milling. The pellets of glass-ceramic composites with different amounts of glass were tested for ferroelectric at fixed frequency (50 Hz), dielectric, and breakdown field properties under a wide range of frequency. Pure ceramic BZT–BCT sample exhibits the well saturated hysteresis behavior, and as we increase the amount of glass composition with pure BZT–BCT, glass mixed ceramic hysteresis loops turn into linear behavior. Compositional enhancement in glass-ceramic composites indicates decrease in the room temperature permittivity and enhancement in breakdown field. The glass‐ceramic composites have shown better dielectric breakdown field but low energy density compared to parent ceramics.

► Synthesized glass‐ceramic composites BZT–BCT for high energy density storage.
► Pure BZT–BCT ceramics exhibit high energy density ~ 7.48 J/cm3 and the measured value ~ 2.10 J/cm3 from P–E hysteresis.
► Glass mixed ceramics exhibit enhanced electrical breakdown field (600 kV/cm).
► Glass‐ceramics show better dielectric breakdown field, compared to BZT–BCT.